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8 August, 14:25

Explain why cos (x) = sin (90-x) for x such that 0

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  1. 8 August, 14:51
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    Use the sin (a - b) formula.

    sin (90 - x) =

    sin90 cosx - cos90 sinx =

    1 cosx - 0 sinx =

    cosx
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